You're publishing a guide and don't want it instantly cut-and-pasted to another site. Or you're sharing a draft and want to discourage selective excerpting.
PDF copy protection exists but it's limited. It stops casual copying, not determined extraction.
What copy protection actually does
PDFs support permission flags — disable text copy, disable image extraction, disable editing. Set these and most readers respect them.
Readers show "copy disabled" when users try Cmd+C. Some readers ignore the flags entirely. Specialised tools bypass them.
Set permissions in the editor
Password-protect the PDF with an owner password and set permissions: disable text copying, disable image extraction.
The document opens normally for reading. Copy operations are blocked unless the user has the owner password to unlock permissions.
Understand the limits
Copy protection stops casual users. It doesn't stop: - Screenshots - OCR of screenshots - Print-to-PDF (which often strips permissions) - Specialised cracking tools
For truly sensitive content, the only safe path is not publishing it widely.
FAQ
Is PDF copy protection legally binding?
The protection itself isn't legal — circumventing it might be, depending on jurisdiction. Doesn't change that anyone can screenshot the content.
Will all readers respect the copy flag?
Most do. Some lightweight or open-source readers ignore it. Adobe, Preview, Edge, and Chrome respect it.
Can I prevent screenshots?
No. Anything visible on screen can be screenshotted. Copy protection limits text extraction, not visual capture.
What's a stronger protection?
Watermarking with the recipient's name. Doesn't prevent copying but discourages it — they know any leak traces back to them.
Copy protection is a deterrent, not a vault. Pair it with watermarking for serious discouragement, and never assume any public PDF is uncopyable.